Journal
PHYSICAL REVIEW LETTERS
Volume 89, Issue 15, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.89.154103
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Quantum states extended over a large volume in phase space have oscillations from quantum interferences in their Wigner distribution on scales smaller than h [W. H. Zurek, Nature (London) 412, 712 (2001)]. We investigate the influence of those sub-Planck-scale structures on the sensitivity to an external perturbation of the state's time evolution. While we do find an accelerated decay of the Loschmidt Echo for an extended state in comparison to a localized wave packet, the acceleration is described entirely by the classical Lyapunov exponent and hence cannot originate from quantum interference.
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